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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d4b884ea5b695ee44f7e0b5257a78f52fa61165202e54d88fb587b99ae686d' 
  AND token = 'B0uPi6GhX66mEnNIbljPGr5N3pw2hIyMPLQAkzik2mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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