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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86cf4a2f90cc27f9102172a56684cb9213011a779938be0907ac000b2ce16376' 
  AND token = 'fFCa3XwDLSWXVtqCn1rsgBEh971bNXtYvl3+kRg1vr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}