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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b425ecde8238c6d1ad1640084a23175cbf4f404bc441e2eb82cf5dc6b08d6cde' 
  AND token = 'UYRaqSafjQRtkcz+MVUvBu0OUMa59vm/SNeyGAZkU8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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