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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d4aa3fb56b57a2401fbd49de004f9970ca999c94c21ac9c12cddea8c8b2e83' 
  AND token = '8FL9bc7qRx60k6T4DQN9Lxm8jbROOagfavaqUqbW3lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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