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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc35beb8a09c1c13a62b5fad28d0b425262885c33628ae3ef97700364867197' 
  AND token = 'EPKX6N0FWbcHWnSLok/1odiNX7UxSlfBnYrO/YKTgJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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