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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f3db69cca92ed1d2100645f383f31963a112d449d9fa92ca9ac3becd239bff' 
  AND token = 'z/WmO8M4b4EqmNXcFO5as1sGR+dxb/aHf7AJsn2vIGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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