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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a7a608430072229430b377aab67e6419aba808a10a2f3e0487bbaa8c164fed' 
  AND token = 'F+CLU2V+3NaVz5+bpFmFIy65Pt8ibzEyxYYNYJPXKrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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