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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3a1799a348a3efa08c2854ad82e5cf9e4ef47cf8bac2ab7542e7ee7440ae18' 
  AND token = 'Rth2UeSbziwbrYtHXK+DhfsBdVWz8VCv7ZZbaXeWlms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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