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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c913d8e0951940dbc6851c02e0b4b0eb331d4ef49a77cefd8c437f277affa3f8' 
  AND token = 'yCgYMZAnRJ6QEaLyddObIMYZNsO4dKL33Xar/y1vubI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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