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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b369a1d87f86f99dce47c01f3b13f69bc3063f7aa4742b4ecdd7f8f0c3931ea7' 
  AND token = 'TE43CWXqCZca2yIdUU+X0yF2x+Vt9RdJpiVHFDlJ8n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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