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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ed04950f6d8bbf7d7d18d3769583f733ec3d97e51703d75834cd5458d44bd1' 
  AND token = 's46jJ03RSnggXE9pmBh7Lg6GR/RysTsBL6+iLCo7l/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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