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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f58cc65718fe252a72c6403bacc461abc2c6fd26041c2386fb08b10a38c1d2' 
  AND token = 'UYeuqUOM5lIv4V0jwFaUch8elFt6mOWCa91kZP1mW1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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