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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aae2c378851049b1e42fc5e3921e5cba7a3b13f78511c47349e320c1980b70c' 
  AND token = 'MclWpOPNW+AeNaahHacWTRU4RTdlUnUwMuAR6PNKWpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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