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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9542bd3f5e22f42584dcbd23ff21a40ffe2cb97a35d76bf070c0b26c11af260d' 
  AND token = '0QvukxWwMcwjjAtps8dXXIo54M68g/7wKXm+kzQEJeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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