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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '458df9301dd9f18332448ef85a687f5f7faadeffc88b38bf10a8eedc674aeb7a' 
  AND token = 'gi1P7ufmynJ9pQCN3ufpmukiwohcuIVpW+URtzGzb7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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