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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b64c88f3ed19d23ec2ac095542a4bcdb4dc39f3a103280fba69d473e826597' 
  AND token = 'LHAB0x1zZ0H4FiCOa1I2GcWPVaQVbeylbjImoNsceVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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