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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cdcc6b5da0b49e1723b1c4c136643449b905ba53f6ec4a44a05ba18bd1141d2' 
  AND token = 'sFeXwmI2ASKCjfKC62XqZuMhhmRYxStn2fsznY6i0TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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