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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0b9cb51b76c0294ad5b7d9a8e9417c21977fc6cabb08a87ff78ccc6cf6106e' 
  AND token = 'aqerIqkOam0JMMRm5TciC7uqbSe0yr/TWk46CgmwJJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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