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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0e50e8c2b5882b0e7e577eb6e9e064adc9ea5f9ba70179bd557b8705040366' 
  AND token = 'rXKeS2Ac2FPXZ9N2Sjj6px2VBxmWL98vDZzO4uxH19o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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