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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc94f27a4b21b2c67a4a6136c489784cc3ef4079571b4273db9e3e1fc3f3a3e' 
  AND token = 'OYU/Np6Y8NW2aMfVdyff95elNiTBLkSRvoi2UmQB6sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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