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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d896a0f0cf55d6e8068b423ac50ca3ee03c81e19f4b0663e296fb017df15cf8' 
  AND token = 'aQWHkbki5T3UrO00w3oqkB+CHCXS1aWok49b/iyYqMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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