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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e411b415ad7a1d158a6c4de8c74e3f59433137b4352f94cd40446769749b893c' 
  AND token = 'QHe0EMD5i+r33wVoP/TZXblxXjx1u/G2bOHzaCKOCfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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