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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d6d70eb61318580c882d3cfcfd839bfe510088e4a214c1f54f2ef9090c0335d' 
  AND token = 'q1r3g19DEiXQAGCRbe7kusWIily1EXBddbQGVltk74k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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