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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526bd32755f503415021de61e84e648d004226c796aa8a6b648b04ed00a97371' 
  AND token = '42mW9Sc4pwnzeL0xPNBPqf8xuO+j2VraieWVjMIieQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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