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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9bf524b63bb8ce512fb0233cd62349e186e4a357245a5944da78cf957644357' 
  AND token = 'NMOPLeFus0BRkb6kNFVQII77sL7mp38bPJAKduvP170=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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