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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3e8786bb9494b1f0ae5f5ef3b56b15f25fd61c0bc28ebacb4543fd1fa7fd98' 
  AND token = 'cl+wfKQz/Af6fcx2uBwvAHTJ3dHFsaZKdKDKqUBQ5H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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