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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac904f7c4b24695b98f6ed9b82f3fa0d9e509bde3b4cc67c6be5f8cccfc5121' 
  AND token = '5h+A0MJWVwfF7JgP55n/BtGWnCR/FbLS7RHS+vaTh2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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