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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0805b4766fd3b9d12cf4d07893b8f1f4e4a78114430a37d3a522a7f8616a4a6e' 
  AND token = 'jepflcpommOJINDbz5Qo3Jm3IWQE0nbDs/97IcG5ovo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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