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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df40448ff296d880181cb0ebc0a7e8651f132148ecfcc37b86bef54fdaee887f' 
  AND token = '12tbYCWh1oidx3A7bFw+9a0GTEFPzidRfY1C1xQ+GzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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