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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '005e28b35f568b44878802cead6555964d6ed39a2843e8e7c1f9247ff298ee0d' 
  AND token = 'Tm3G6aw7kTxliv/2izvSMPH9jOx2fyU7iu1vb5Ke7es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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