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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc65ec60fffda412436263ddca363282ca97f5738f813ba53508280df30b927' 
  AND token = 'G9gjgHnyM4+n3/ti6OSzQs3slRu02qDWncd1XEuU3oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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