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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73051095ca9fbb8c1b5d410aeca9e9861e1b48e41ef920bbcf8e0301c8bc1748' 
  AND token = 'Q3LIAVQar2pP5WN+VpBnEkPxOrqkmRfhO4/+ZhAsqPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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