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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a899d66a5186b101e3140ca261b74b53d7d0722af274b1008c6f78858efd87' 
  AND token = 'va9eMIJ768Oqba9iXl8aWqVkRYBj42mslIkbeTDDmP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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