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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e967468adadc58b98784241023aeaa61955e9c798a545753b1d1f32e3420885e' 
  AND token = 'RrWFq2tmYC1OkGerO7/qH5CuT/CYFPa1BH+b/9FHsuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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