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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eccc8e66a83c9be145f02ab24eb0ac56c0f6056a412dba0b3913888886d5b11' 
  AND token = 'f2KvsikaQ70K781u8G1CH5Wn9bzDXVpETAoQYaU+sEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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