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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6686f9d4e47960a02d926c3f36f57f6d5d1ecc5a0e09ca2bed12c8af753f8e5f' 
  AND token = 'LYy47FL3oqggNA7MMq3wxac5HDqskjMirQZKM6sB7UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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