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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b0c69df91fd08d3b0eaabaa0605a40929b9756e56ef24420779ea2ae5398ef' 
  AND token = '3E4oVMme6at4V2jnkpW2nvvsV0OUyKw7q7XvwTtl4Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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