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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1f21a682e35ddaabd4d4cc8bad56c92a7479f8891683175b6ed7dc0d7eb2e9' 
  AND token = '2LD7IMz38q0if4E2DdEcQYgezSuI3LCZGyqRcjcbS/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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