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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5873dce1c2c4484d5ac8d5769c34524b4fd32176a7df505fef6181ec1ef15a8' 
  AND token = '2q5VO0ASyeVHpVmfVk7Ah+yj7lyZNFrwvOg2LtbVseo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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