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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '733b4fb3a6048ea386849624691f47004c38a383c637a313dd6f7272a67306b0' 
  AND token = '1l8ZWoanqyS3WfYt0VmVLRz+EzvByIGk3ialpRpQCPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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