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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e56642cad47c96dec3ad87baa7d5d6fb85b843f4d00827f6bbf3f5e885da7c' 
  AND token = 'l05uB1fSRVEp202X4fBDGsputTL1oc2SVcCFluZMIfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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