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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e88b4c0670a0ea978dd95370879629c9a2f0f2a55a8f049195353e23c65584' 
  AND token = 'nY/nfyQXj+A90uoJMFkfEopkYBP0OQyF/THkijbS2y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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