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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b4277f86ce4e3543f80c5919df7d4a261341cd778b8cbd3ed9c29f3d50d936d' 
  AND token = 'sWqdxfIPO0Cj2ITCvefn+HlB6nf3SatvxjUYySN3zv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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