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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e14e1f0ac0ee07a99d799c68da365d278ad596d01e47d0c3bcf6859bc84ec8' 
  AND token = 'nEc9oeseL2ppcOnbKMCavZMzmRDmAzIrLGC2dGRo+9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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