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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f95b28c1afd3629dbec08246b2e27b1085306001d1d6ff0b9ab59407236f0c' 
  AND token = '1zrvDIYJksf+2dRMYdm+tp6+HFkfcq6P4Elu6YDaZ7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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