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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e7a2ce9a354c5aad6cdbab6715976723a9c6290eb1763c60e5241dc3f780af' 
  AND token = '7PRL9ZfXyb1wxqGK4LPFqW2rNEflAteBmbVrITclr8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00862

JSON explain

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