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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c72b374b22a56158d665ead38dd8b864d7be53ffd6daf24223306a23800d50fd' 
  AND token = 'pkz20yatnfTdolhl7NmxR15obGYj2udlVOPWNNNqYlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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