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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f2f60132ac03485f45e823e1bae8fbde2c7e450a726851861b18943241317e' 
  AND token = '1r33btAOr0Y74iPqDd3ss8FIT97OBQimiGAioYZ7Xes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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