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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e003ceee68da7a1081e9fb67ec7769eb2d6cf7c9ca89ca8551cf0cee00de9a' 
  AND token = 'g4qk8fpw9ANHKQg7ANNwd4x+4uGSIaB1G1z3BzrY15E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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