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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2634249ecd54068760ca9698c9474ced96a32201d01bac3b0862901e2b3ba3b' 
  AND token = 'TiWqXyUtCgZZb3Cg/uLKney7Qd1xusEM9KMVBRbj4r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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